# Relationship history for MSHA mine 1510064

Current hierarchy: **Flavin Raymond & Eugene Schwartz → Mey Nart Coal Company → No 1 Surface**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Toler Creek Mining Company Inc → No 1 Surface; 1976-10-01 to 1977-03-29; source msha-controller-operator-history
- **controller_controls_mine:** Holsclaw J Douglas → No 1 Surface; 1976-10-01 to 1977-03-29; source msha-controller-operator-history
- **controller_controls_operator:** Holsclaw J Douglas → Toler Creek Mining Company Inc; 1976-10-01 to 1977-03-29; source msha-controller-operator-history
- **operator_operates_mine:** Mey Nart Coal Company → No 1 Surface; 1977-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Flavin Raymond & Eugene Schwartz → No 1 Surface; 1977-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Flavin Raymond & Eugene Schwartz → Mey Nart Coal Company; 1977-03-30 to current/open; source msha-controller-operator-history